/Engine/Source/Runtime/CoreUObject/Public/UObject/PropertyOptional.h
A property corresponding to UE's optional type,TOptional. NOTE: this property is not yet handled by all UE subsystems that produce or consume properties.
class FOptionalProperty : public [FProperty](API\Runtime\CoreUObject\UObject\FProperty), public [FOptionalPropertyLayout](API\Runtime\CoreUObject\UObject\FOptionalPropertyLayout)